Engine of the two-stroke type



Sept. 1931. E. H. TARTRAIS 1,823,770

ENGINE OF THE TWO-STROKE TYPE Filed Nov. 2a. 1929 6 SheetsSheet' 1 Pi .2 5 h A w 7 L I fi Fi .5 3 g J //V/ /V70R:

New flux/n. M 4% M 6 Sheets-Sheet 2 Sept. 15, 1931. E. H. TARTRAIS ENGINE OF THE TWO-STROKE TYPE Filed Nov. 26. 1929 GSheets-Sheet 3 Fig.9

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Sept. 15, 1931. E. H. TARTRAIS ENGINE OF THE TWO-STROKE TYPE Filed NOV. 26. 1929 Sept. 15, 1931. E. H. TARTRAIS ENGINE or was TWO-STROKE TYPE 6 Sheets-Sheet 4 Filed Nov. 26. 1929 FigQO Sept. 15, 1931. E. H. TARTRAIS ENGINE OF THE TWO-STROKE TYPE Filed Nov. 26. 1929 6 Sheets-Sheet 5 r o t n e D n 3 Gttomeg/J.

Sept. 15, 1931. E. H. TARTRAIS ENGINE OF THE TWO-STROKE TYPE Filed Nov. 26. 1929 6 Sheets-Sheet 6 Pi g. 25.

Gttorncgn Patented Sept. is. 1 31 I 1,823,770

UNITED STATES PATENT OFFICE EUGENE HENRI TARTBAIS, F HONTMOBENCY, FRANCE ENGINE OF THE TWO-STROKE TYPE Application filed November 26, "1925, Serial 1T0. 409,890, and in France November 26, 1928.

Cylindrical valves, chiefly em loyed for Fig. 7 shows in section a lubricating two-stroke engines, are alrea known, pump; which possess an alternate recti inear mo- Figs. 8 and 9 are sectional views illustion and act as fluid control valves, then retrating the fixation of an inner sleeve to the turnin upon a seatin after the manner of cyhnder,

an ordinary valve. l lowever such devices Fig. 10 is an axial section of another cmare defective due to the fact that it is very bodiment of the invention; diflicult to provide leakless conditions for 'Figs. 11 and 13 are vertical sections of the ating, the two parts respectively of the cam;

The present invention relates to valve Figs. 12 and 14 are a correspondin Ian 00 gears offering new and important advanand a section respectively on the line H tages such as the use of an im roved sys- 0f 1g. 13; tom of lubrication for the cylinder, the F 1g. 15 is a development of the cam made feasibility of regulating the valve gear as of the two parts shown in Figs. 11 to 14;

5 desired, also the elimination of the scaveng- F lg- 16 IS an analogous development of 6 ing pum and oth advantages as ill b the cam In another relative position of the further set forth. P t

he said system is chiefly characterized g 7 o 23 re cr s-sections taken by the use of a combined slide valve and along the 11I1eS A, B, C, D, E, F, G, re-

poppet valve, analogous to the aforesaid p t y 9 F g 15 a 9 known val b t d t d t l f an Fig. 24 is an elevation partly in, section alternate rectilinear motion, but also for ro- 0f aflothel emhodlmeht of he invention; tation about its axis, that is, the axis of g- 25 illustrates the perati n of the the cylinder, special means being provided 25 for a reliable and abundant lubrication of g 26 and 27 Show a. detail. 75 the said valve and especially of its seatin The 1IlVeI1t-l0n W1ll fir be de cribed in its This affords the following results: (1) the slmplestj 111 Order to Show t nsaid seating is made leakless by the condamental p p It is Observed in F igure stant presence of this oil which is distribut- 1 that the Slide-Valve 1 0011313 of y 30 d by th t ti d (2) th t ti drical body whose'internal wall preferably 80 maintains the seating in a well ground and serves as an extension of the y n ll,

clean condition. The lubricating means and Whose external Wall is provided with m y vary p o id d th id d i d t are a cam affording axial displacements. Figobta-ined, but a suitable means for lubricalire Shows the external development of tion which is particularly advantageous will the shde Valve of the 0810- The m 85 be hereinafter described. i of rotalflon 1s fil the g Fig. 1 is an axial'section of a simplified 2 111 mesh wlth ed P 3 i embodiment of the invention; h on the cyhnder mounted Fig. 2 is a diagram of the development 2 members or Timers 4 m the salne of the cam; r as the g osses o of the cam (Fignr 1, 00

Fig. 3 is an axial section similar to Fig. i i 3) 3 valve.m the 1 showing the slide valve in another posig g z i at tion; referably em ll) id and in tliis event th Fig. 4 is an axial section of another emsalve rotates i ihi d the engine speed? 98 i 0f h invention; Obviously, all homes and rollers have an Fig. 5 1s a diagram of the development of identical disposition and an equidistant po the cam shown in Fig. 4; sition, and thus at each, ,5 revolution of the Fig. 6 is an axial section of another emvalve, that is, at each revolution of the enbodiment of the invention; gine, andat the proper time, the valve,

ond layer.

interior forms a round roll, and this is, at

When the valve again raises,

which is actuated at three points will rise, thus compressing the spring 6, after which the spring returns the valve to its seat.

In Figure 3, the piston is at the lower part of its stroke and the valve is open; the scavenging thus takes place. The arrows show the path of the fluids, that is, the air and the residual gas.

The overlapping part 7 of the lower end of the valve is not obligatory, and the arrangement might be used without this overlap, for instance with a slow-speed engine; but for high-speed engines, for which the device is chiefly adapted, obvious, since by this overlap the valve can actually be termed a ates in fact as a slide valve, that 1s, it opens and closes at full speed. It acts as an ordinary valve only as concerns leakless conditions at its lower part. In this description, the terms upper, lower, up, down, rise, descend etc. refer solely to the figures. The upper part is made leakless by 1\fiackings or rings 8.

o particular lubrication is shown in this first example. Figures 1 and 3 show the general case of an internal combustion engine with ignition by sparking plugs, an with scavenging by carburetted air. The oil is supposed to be introduced into the charge by one of the known methods, and this oil covers the walls of the collector and advances gradually towards the interior, entrainedby the current of air. It is observed in Figure 3 that the valve necessarily stops this flow;'at each stroke, the valve cuts through the layer of oil, and forces the oil u on the seating herein consists o a shoulder of the cylinder; as the valve continues its uniform rotation, it distributes the oil periphery of the seating 9, while at the same time it expels oil which is taken up on the outside and forms part of the sec- The oil which is expelled in the once spread and taken up by the piston. the surface of the valve wh ch has remained in the oiled condition will make contact with the upper guide 10. and the packing) 8. This u per part is formed and assem led as in .tlEe ease of the Knight valveless engines. The oil, which necessarily circulates through the packing 8, lubrieates the cam, rollers and gearing, and if the device is leakless at the exterior, (as it should be) this oil will of course return to the valve.

It is thus evident, as stated, that an abundant oiling is provided for the valve and particularlyfor its seating, as all of the oil intended forthe cylinder-which evidently requires more than the valvemust necessarily flow under the seating of the said valve. This arrangement is employed to the periphery of the its advantage is.

slide valve; it o era 9 which upon the whole produce a joint which could not otherwise be made tight except by the use of an excessive strength for the spring 6.

Qbviously,the spring 6 may be given all necessary shapes, or it may be replaced by a pluralityv of springs which are individually guided and are equally spaced upon valve; and further, the said spring or springs may bear upon said valve through the medium of special members operating by friction or by rolling eontact.

The aforesaid represents the simple and fundamental form of the apparatus, but it is subject to various changes in the way of improvements. Instead of disposing the cam upon the valve, it may be mounted on the cylinder, and in this case the valve carries the rollers. The valve is thus made lighter, and other very tions will result, as will be further specitied. A lighter construction is also afforded by making the gearing 3 as a separate piece and by operating the valve by slidable keys. The cam disposed on the valve or on the cylinder, may comprise a double operative surface, thus affording a desmodromic eontrol; but when the said cam is mounted on the cylinder, it is better adapted for replacing the spring 6 by another type of spring which acts only in the closing position, thus holding the valve upon its seating 9.

Figure 4 shows such modifications, indicating the double cam 11, whose developed form is shown in Figure 5. The said cam is held in the proper angular position, but in this positign alone, by studs which are not shown. The valve 1 is provided with rollers 12 which can be mounted upon smooth journals east in one with the valve. At the upper part of the valve are the keys 13, integrally cast, which are slidable axially in grooves 14 of the (geared'part 15 which is -no longer axially isplaeed but is held by stops 16-17. A desmodromic control is employed, but a spring 18 in the form of a concave disk is disposed in such manner that it rests upon a fixed stop 19 screwed into the, cylinder, and it urges the cam 11 downwardly, which cam is a compact and rigid piece and makes contact by the parts 20-(Figure 5) of its upper contact surface with the rollers 12 of the valve, thus urging the valve upon its seat 9 at three points. To carry this out, a very small play is allowed at 21, below the cam piece 11. When the valve begins to rise, or is about to begin, the valve will remain stationary for a moment, in the axial direction, and the cam piece again descends in order to make contact at its lower face, thus taking up the play 21, and in this manner the whole action will take place as if the spring 18 were'not emfiloyed.

the said device, the valve makes conface of a s1 tact at 9'with a shoulder of the cylinder; but a certain play is nry at the outer part of the valve, and also, the cylinder is subject to elliptical wear, so that if the piston is to cover the tion, as above stated, a dilliculty is found by reason of the fact that the valve and cyl inder are not in exact coincidence, and hence is preferable that the slide valve supportmg part 9 of the cylindershould be formed, not by the cylinder itself, but by the upper eeve having the same thickness as the slide valve and consisting of the same metal, also having the-same play, care being taken to avoid elliptical wear of said sleeve. e sleeve may even be fitted into the valve (as shown at 23 in Figure 6), and this fitting or joint may be a 0st without play, since the expansion of the two pieces is about the same. Thisdevice is shown in Figure 6, and in this connection, mention will be made of the lubricating arrangement which is particularly advantageous, as above stated.

Like numerals indicate similar parts, as shown in the preceding construction. Furthermore, the device comprises a sleeve 22, which is herein represented with a fitted joint 23 and is freely movable in the cylin- The joint 23 consists, as shown in Fig. 6, of an annular flange on the lower part of the valve 1 and an annular groove in the upper part of the sleeve 22.

At 24 is observed acoupled pipe for the supply of oil under pressure from a pump shown in Figure 7, said pump operating as follows: When the tom of its stroke, it being urged into this r .The cam Wlll for position (as shown) .by the spring 26, the oil enters the main bed of the pump through the orifice 27; t is oil is either is discharged under pressure by t e general oil ressure lubricating circulation employed or the other mechanisms. instance rotate at ten the engine, and it is set the piston 25, thus sendthe clock valve 30, the bepositively held the sleeve- 22 on circulation of part of the cylinder. For this reason, and also since the lay at 32 may be made less than at 33, e oil supplied under pressure at 24 is almost entire y circulated to the slide valve. The continual afilux of the scav air prevents its return to the conduit 0% the same; it is expelled in the form of a absorbed by alread fi t V y speci- It should be noted that the sleeve 22 tends tobedrawnbyfrictiond the rotation of the slide valve at the times at which piston 25 is at the bot-' '38 of the seating of angle that when the hm 29 d thin sheet, which is g it is not covered by the iston; if all is in proper order, this shoulii produce a slow revolution by which all elliptical wear of the sleeve is prevented; For like reasons, there, is represented a iston which is rotatable due to a ball-an-socket joint at the end of the iston rod. movements, the oil is well viously, the arrangement is completed by various means adapted to prevent the oil from rising from the crank-case into the cylinder.

Since the sleeve 22 is urged in rotation with but a very small force, the fact of is in perfect means should be provided for observing this fact. By way of-example among the numerous means which ma be provided, Figure 6 shows a small puss-piece 34 cooperating with a recess in the sleeve; the recess thus movesthe Due to all these distributed. Ob-

bservation, or for the control of a suitable signal. 7

The accessory use of the movement of rotaiiou of the valve may also be applied to the cylinder head itself. s shown in Figure 6, the cylinder head is in one piece with the screw plug or cap 35, but it consists of two members The joint 37 comprises no assembling means. 'However a suitable element (not shown) is provided in order to prevent the cylinder head from falling into the cylinder. During the operating period, the gas pressure strongly closes'the scavenging 'Eriod, the'remay be a time at 7 he system is almost entirely discharged, and the slide valve then draws with it the cylinder head by the friction of the packing or in any other manner. Figure 6 shows an engine of the injection type, operating by spontaneous ignition. The joint the fuel nozzle 39 is selfclosed, and has a free action, and hence nothing prevents the free rotation of the cyliner head, while the said fuel nozzle remains stationary. Such rotation may be of use with an air-cooled engine, which is the case in the present example. The concave por tion 40 is not open to the wind, and it is thus provided with I and the unsymmetrical disposition of the apparatus is corrected by the rotalion of the cylinder head.

It will be observed that the defect in the fitting which is avoided in the joint 9 by the use of the sleeve 22 is made evident below, at the joint 31 of the sleeve with the cylinder; but in addition to the fact that it is less manifest, for obvious reasons, the conditions, may be improved by the use of rounded parts 42, which could not be employed with the joint 9.

Figure 6 shows a sleeve 22 which is freely joint 37, but during the no longer made a deflecting screen 41.

8) by means of a rib 43, which can be readily provided if the cylinder consists of two I provided with a safety valve 52; an apparts.- This is the case, for instance, with an air-cooled engine in which the lower part of the cylinder 44 is of steel and the upper part 45 of aluminium sists as shown in Figure9 in providing in the sleeve a groove'46, coinciding with a deeper groove 47 in the cylinder, said grooves containing a split ring 48 of the type of the known piston packing ring, and the sleeve thus maintained has the advantage of being readily removed if the ring 48 can be entirely contained in the cylinder groove. For this purpose it is simply necessary to open the slot by a tool which is inserted through a suitable aperture in the cylinder.

The preceding. considerations specified certain advantages obtained by the use of a cam which is disposed upon the cylinder, but other advantages are afforded. The cam need not be secured by pins, but it may be connected by suitable means with a suitable control by which the device can be set as desired.

Figure 10 shows such an arrangement, by way of example. The same reference numerals are employed. In addition the device comprises a gearing element 49, secured to the cam, and a gear wheel 50 under the control of a lever 51. As a modification, the spring 18 is no longer in contact with a stationary piece, but it rests upon the gearing 15 controlling the slide valve; said gearing makes contact with the plug 35 which is herein formed in one with the'cylinder head. In this 'examplethe engine is water cooled; thecontrol for the valve and for the-supply of the scavenging air (not shown) are supposed to be situated in anoiher sectional plane, in order to simplify the figure.

The cam may be more or less displaced in the direction of motion by the lever 51, thus relieving the compression of the ngine and allowin it to start with facility. In fact, at the dower dead centre, the cylinder is filled with air through the exhaust orifices; this air is compressed when the piston returns, and it escapes into the scavenging conduit when the valve 0 ens at its upperdead centre. This impe ing arrangement is very powerful, and it can be regulated at will by the use of the lever 51. Such a device is chiefly applicable to motor vehicles. Obviously, the conduit for the scavenging is roved disposition consists in discharging 1t into the. exhaust through a conduit such as 53, leading to the oint 54, and so directed that the 011 from 0 yalve be thrown Another means con-' with great force at 55 return to the cylinder, would be contaminated with carbon.

The preceding dispositions relate to cases in which mechanical simplicity is the chic object.

A modified form of the cam will now be described, by which the adjustment of the point of opening of the valve and of its point of closing, can be separately effected, also showing that the technical advantages of this arrangement may in certain cases largely compensate for any slight complication.

" he cam is now made in two parts, and the said cam is shown in detail in 11 to 23.

Figure 24 shows the parts assembled and disposed in the cylinder, also representing suitable controlling means for the same, which means are chiefly applicable to aeroplane engines of the radial type.

.It is observed in these various figures that the two parts of the cam comprise a respective gearing member 56-57. The lower portion com rises the lower cam surface 60 and a part 5859) of the upper cam surface, or the one corresponding to the lift of the valve. The upper portion comprises the upper cam surface, less the aforesaid part. The two members are fitted into one another,

for in such event it and each may be turned about independently of the other, within the limits allowed by the guides 61, which guides afford the continuous travel of the rollers during the part of their path (fir-G3, which corresponds to the time during which the valve is upon its seating; but during a part of this movement, the rollers rest upon onl one-half of the width of their contact sur ace (Figures 21-22-23). The spring 18 (Figure 24) is situated as in the preceding example. The control is still desmodromic as concerns the lift, save in the very small part 59 at the end (see the details) in which the angle is cut down. On the contrary, in the osition shown in Figure 15 (development) the descent 65, 66, (i7 is only half controlled, that is, in the part 65-436 corresponding to the accelerated mot-ion. This is not necessarily exactly one-half, as in the figures,and it is possible to provide at the middle a ortion having a uniform movement. vIn

and will not tend to Figures the part 66-67, the valve continues its moproduced upon the setting, but without prejudice, for in the first lace the surface of the engine, also with the load, and with the the seating is considerahle with reference to pressures, temperatures and densities of the the weight of, the valve, and secondly, the residual gases and the atmosphere. Howshock takes place upon an oil cushion. ever, due to the aforesaid control, the air The outline of the cam may be such as inlet can always be opened at the pro er to provide for a positive control as far as time, and it is closed when desired, this the point at which the valve reaches the level ing an essential feature. 1 of the joint 7, which is the only important In the special case of an aeroplane engine, factor for the gas control. advantage may be taken of the ressure The control of the angular position of the produced by the travel of the aeroplane, by 76 cams (Figure 24) is effected by the gearing disposing air inlets against the Wind. Furelements 70 and 71, which may consist of thermore, if the exhaust pipes are'sufiicient: two toothed sectors, as also the gearing elely cooled by an internal air circulation, acments 56 and 57 (which is herein the case cording to a known method, these may be for the first two). The gearing elements disposed in the interior of the aeroplane so 70-71 are in the present construction sebod y. cured to hollow rods -76 concentric with It should be observed that theaforesaid the control 72 of the valve. A spring 73 regulating arrangement is not exclusively herein makes the whole device leakless, and employed to eliminate the scavenging pump,

' prevents the oil which is situated at 74 and and it Will prove useful even should this comes from the cylinder by leakage, as pump be employed, since'it will reduce the stated, from returning to the crankcase work of said pump. Only the variation ofthrough the hollow rods 7576 the closing point is of interest, by offering, owever the bushing 77 is lubricated with among its various features, a particular clean oil fed under pressure through the means for varying the load; duct 78, and which is returned to the crank It is also feasible to employ solely fo1 case by escaping through the detent groove starting purposes, a scavengin pump which 79. can then be uncoupled, or-w ch is auto- The different shafts 7275 76 are,- secmatically uncoupled, and the said pump tioned at 808182 .for assemblin purmay serve at the same time as a starting poses. At 8384, that is upon a fixe part, device known per se. Herein the charge are mounted stufling boxes which readily (or pressure) supplied by said pump or moprevent all loss of oil. The hollo rod tor is delivered through a coupling device 85-86, which are in line with the rods 75 96 (F lgure 24) and the air supply nozzle p 76, are secured to toothed sectors of tapered no mal speed 18 closed by an automatic 10o shape 87-88 engaged with two respective Ytllve l h opens when the proper speed gearing elements 8990 whose axis coinis obtained. cides with the axis of the engine. At the The term e xha st herein employed side of the crank-case, these two gearing 0011081118 the av nging Wi h ut pump a elements engage two toothed sectors 9192, to be taken y, and the result change at Will the angular'position of the box h g htt snnilar to 8788, but externally connected wlll b pm t y the Same if all at the to controlling levers 93 94, adapted to g exhaust p f d to a mm fll e resistance. If such a deannular members 8990, and hence, by V109 lsocolhhhled with Scaveng. means of 87, 88, etc. the adjustment of P p, If throttle Valve 19 (imposed at the 110 the fluid control in all of the cylinders and 9 t of the h and if i Valve in the same degree is operated to obtam a temporary increase The fact that the said regulation can be of the Welght of the charge (P and carried out in a very convenient manner, hence of the cflullle, acooldlh to a known affords particular]? advantageous results, in method, the 531d arrangement 15 h t the case f ael-op ane engines and hi fl cue due to the fact that when the valve is as follows n tally opened, the scavelagmg pt g For such uses, it is possible toemploy long w ch 13 normally of excesslve slze exhaust pipes, and to use one such pipe for h be dischargedeach cylinder. However it is a well-known obvlouslfla the hlvehtioh is lhlll'ted to fact that in a two-stroke engine in which the the use of t e hlechamchl detafls l' P P" free exhaust takes place'through a long pipe, Slanted, and 1t compl'lses all modlficlltlons there IS a certain speed at which the scaveng- ,whlch may be emgloyed y a Person skilled ing takes place by self-action, by the effect m the art and 19h are out of the limits of inertia, but this takes place only at a of the Present n q Bllt t 18 lllldersingle speed, since the air inlet mu t o en BtOOd that the descriptlons relative to the at the exact time at which the optimum con- Several figures represent y pl s f ditions prevail for this effect, and this time, construction. 7

considered from a mechanical point of view It is however of interest to chiefly mention varies to a great degree with the speed of the following'detail modifications.

1. With reference to Figure 6, if the friccam, a pressing upon said cam and tion drive of the sleeve 22 and of the cylmeans w ere y the said valveis continuousinder head 36 is not suflicient this may be ly rotated upon its axis.

effected in a positive manner by any suit- 3. In an internal combustion engine of the able mechanical device adapted for continutwo-stroke type, whose cylinders are pro- 7 ous or intermittent action. vided with a row of exhaust ports which 2. It is possible to avoid the elimination are uncovered by the piston at the end of of the cam outline represented at 59 (Figits stroke, and with a row of ports for the ures 1115-16) by means of the arrangeadmission of fresh fuel at the other end of ment shown in Figure 25, which is readily the said cylinder, a cylindrical slide valve observed. The vacuumat 101--102 has no adapted to open and close the said admisimportance, since at this time the slide valve, sion ports by sliding a reciprocating mowhich is axially urged only by its very small tion; a plurality of rollers disposed at the weight, is in fact held in place, in this diperiphery of-the slide valve; a double outrection, by the friction of the packing. lined p0 ion of said cam which is adapted 3. Figure '26 shows a roller adapted to to receive and to ide the said rollers; a prevent shocks, which consists of a central pla being provid below the bottom of the core' 104 and a ring 103, having between sai cam; a s ri pressing upon said cam;

thema member 105 which is not readily deand means w ere y the said valve may be m formable, due to its shape or its substance. continuously rotated upon its axis. 4. Figure 27, which is a partial section of 4. Inan internal combustion engine of the the slide valve through the axis of a roller, two-stroke type, whose cylinders are proshows a means for obtaining thelubrication vided with 'a row of exhaust ports which of the journals under pressure, by means are uncovered by the piston at the end of of the duct 106. According as the orifice its stroke, and with arow of ports for the 107 is situated below or above the packing, admission of fresh fuel at the other end the oil is driven to 108 by the pressure of of the said cylinder, a cylindrical slide valve the gases or by centrifugal force alone. Obadapted to open and c ose the said admisviously, all precautions are taken to prevent sion ports by'a sliding reci rocating mo- 30 all leakage of gas or even a too rapid extion; acamhavin'ganoutline portion coo pulsion of the lubricant. For this purpose, erating with rollers in order to produce the the journal is adjusted in a very'accurate sliding motion of the said'valve, abutment manner; the hole 108 is very small, and is means cooperating with said valve in the situated at the top, so that the roller will closing position, a toothed ring surrounding 35 press upon it during the periods of fuel said va ve, a pinion adapted to rotate the admission. said ring, and slidable means imparting the What I claim is rotation of said ring to said valve while 1. In an internal combustion engine of permitting the sliding motion of said valve. the two-stroke type, whose cylinders are pro- 5.. In an internal combustion engine of 40 .vided with a row of exhaust ports which are the two-stroke type, whose cylinders are ro- "uncovered by the piston atnthe end of its vided with a row of exhaust ports w ich stroke, and with a row of ports for the adr unc vered by the piston at the end of mission of fresh fuel at the other end of h r ke and with a row of ports for the the said cylinder, a cylindrical slide valve fl m fm of fr f l at he o h r end of 45 adapted to open and close the said admissaid cyhnder, a cylindrical slide valve a apt:

- sion ports by a sliding reciprocating motion, ed to 19 and 01086 the i e S P a cam having an-outlined portion oooperatby a S lding reciprocating motion, a pluraling with rollers in order-to efiect the slidity ofrollers disposed on the tfierilphery of ing motion of the said valve, abutment 881d valve, e can 8 do ble on 'n portion 50 means cooperating with said valve in the f rmed upon sa1dcam and'cooperating with closing position, and means for continuously d mil 8 play being allowedb low the rotating said slide valve on its axis. bottom sur ace of sa d cam, a spring adapt- 2. In an internal combustion engine of ed to bear upon said d g the two-stroke type. whose cylinders are prosurr nding stud valve, a pimon adapted to 55 vided with a row of exhaust ports which are r tate the said ring, and slidable keys con- 12o uncovered by the piston at the ,end of its P Velve to id ri g whereby the t k d ith row f ports f th d. mug is enabled to rotate the said valve while mission of fresh fuel at the other end of the the Same Permittmg tho i g i said cylinder, a cylindrical slide valve adaptbf 8 valver 6o ed-toopen and close the said admission. ports-- 6. In an engine as claimed in claim 1, by .a sliding reciprocating motion, a cam packing'members disposed on the outer'face having a double outlined portion cooperatof the cylinder head in coincidence with the ing with'rollers in order-tqefiect the slidinternal face of the valve, for leakless oping motion of the said valve, 9. play being oration. Y

65. provided below the contact surface of the 7. A'me ed for the lubrication of the slide valve specified in claim 1, which conslsts in mixing, with the charge admitted nto the cylinder by the slide valve, oil which is in a state of fine suspension in said charge.

8. In an internal combustion engine of the two-stroke type, whose cylinders are provided with a row of exhaust ports which are uncovered by the piston at the end of its stroke, and with a row of ports for the admlssion of fresh fuel at the other end of said cylinder, a cylindrical slide vah'e adapted to open and close said admission ports by a sliding reciprocating motion, a cam having an outlined portion cooperating with rollers in order to produce the sliding motion of said valve, abutment means cooperating with said valve in the closing position, means for the continuous rotation of said valve on its axis, a shoulder on the internal wall of the engine cylinder at a certain distance from said valve, an annular sleeve situated upon said shoulder, an annular flange on the lower part of the valve, anda groove formed in the upperipart of said sleeve and adapted to receive the said flange.

9. In an internal combustion engine of the two-stroke type, whose cylinders are provided with a row of exhaust ports which are uncovered by the piston at the end of its stroke, and with a row of ports for the admission of fresh fuel at the other end of said cylinder, a cylindrical slide adapted to open and close said admission ports by a sliding reciprocating motion, a cam having an outlined portion cooperating with rollers in order to produce the sliding motion of said valve, abutment means cooperating with said valve in the closing position, means for the continuous rotation of said valve on its internal wall of the engine cylinder at a certairn distance below the said valve, an annular sleeve disposed upon said shoulder in the interior of said cylinder, an annular flange on the lower part of the valve, an annular groove formed in the upper part of said sleeve and adapted to receive the said flange, and means provided on-the wall of the engine cylinder for the introduction of lubricant between said wall and the said sleeve.

' 10. In an internal combustion engine of the two-stroke type, whose cylinders are provided with a row of exhaust ports which are uncovered by the piston at the end of the stroke, and with a row of ports for the admission of fresh fuel at the other end ,of said cylinder, a cylindrical slide valve adapt, ed to open and close said admission ports by a sliding reciprocating motion, a cam, an outlined portion of with rollers and having the same outline repeated three times on its periphery, and means for imparting to the valve a continuous rotation on' its axis which is equal to onethirdof the speed of the; engine.--

are uncovered by said cam cooperating- 11. In an internal combustion engine of the two-stroke type, whose cylinders are provided with a row of exhaust ports which are uncovered by the piston atthe end of the stroke, and with a row of ports for the admission of fresh fuel at the other end of said cylinder, a cylindrical slide valve adapted to open and close said admission ports by a sliding'motion, a cam having an outlined portion cooperating with rollers in order to produce the sliding motion of the valve, abutment means cooperating with said valve at the end of its stroke, means for the continuous rotation of the valve on its axis, a shoulder situated on the internal wall of the engine cylinder at a certain distance from said valve, an annular sleeve disposed upon said shoulder, an annular flange situatedat the lower part of said valve, a groove formed in the upper part of said sleeve and adapted to receive the said flange, an orifice in the wall of said cylinder in coincidence with said annular sleeve, and a proportioning pump adapted to supplv a suitable lubricant, through said orifice, between said wall and the said sleeve.

12. In an internal combus ion engine of the two-stroke type, whose cylinders are provided with a row of exhaust ports which the piston at the end of the stroke, and with a row of ports for the admission of fresh fuel at the other end of said'cylinder, a valve adapted to open and close the said admission ports by a sliding reciprocating motion, a cam having an outlined portion cooperating with rollers in order to produce the sliding motion of said valve, abutment means cooperating with the said valve in the closing position, means for the continuous rotation of the valve on its axis, a shoulder situated on the internal wall of the engine cylinder at a certain distance from said valve, an annular sleeve disposed on said shoulder, an annular flange at the lower part of said valve and a groove formed in the upper part of said sleeve and adapted to receive the said flange, means imparting the rotation of the valve to said sleeve, and means for controlling the rotation of said sleeve from the exterior of said cylinder.

13. In an internal combustion engine of the two-stroke type, whose cylinders are provided with a row of exhaust ports which are uncovered by the piston at the end of the stroke, and with a row of ports for the admission of fresh fuel at the other end of said cylinder, a cylindrical valve adapted .to open and close the said admission ports by a sliding reciprocating motion, a cam having an outlined portion cooperating'with rollers in order to produce the sliding motion of the said valve, means for maintaining said valve said valve, means and adapted for control and means whereby the rotation of said valve is imparted to the cylinder head.

14. In an internal combustion engine of the two-stroketype, whose cylinders are provided with a row of exhaust ports which are uncovered by the piston at the end of the stroke, and with a row of ports for the ad mission of fresh fuel at the other end of the said cylinder, a valve adapted to open and close the said admission ports by a sliding reciprocating motion, a cam having an outlined portion cooperating with rollers in order to produce the sliding motion of the said valve, abutment means for maintaining the said valve when in the closing position, means operated from the exterior of the cylinder for regulating the angular position of said cam, and means for imparting a movement of rotation to the said valve upon its axis.

15. In an internal combustion engine of th two-stroke type, whose cylinders are provi ed with a row of exhaust ports which are uncovered by the piston at the end of the stroke, and with a row of ports for the admission of fresh fuel at the other end of said cylinder, a cylindrical valve adapted to. open and close the said admission ports by a sliding reci rocating motion, a cam having an outline portion cooperating with rollers in order to produce the sliding motion of the for maintaining the said valve in the closing position, a toothed portion on the periphery of said cam, a toothed sector cooperating with said toothed portion from the exterior of said cylinder, whereby the angular position 1 of said cam 'can be varied, and means for said valve upon its axis; V combustion engine of whose cylinders are' 'atin imparting a movement of rotation to the said valve upon ts axis.

16. In an 'internalm-combustion engine of the two-stroke type, whose cylinders are provided with a row of exhaust ports which at the end of are uncovered by the piston and with a row of ports for the the stroke,

admission of fresh fuel at the other end of said cylinder, a cylindrical valve adapted to open and close posed of two superposed members. whose combnation forms a with rollers and thus effecting the sliding motion of the said valve, means for regulating the angular position of said members, each independent and means for imparting a movement of rotation to the 17. In an internal the two-stroke type, provided with a'row of exhaust ports which are uncovered by the piston at the end-of the stroke, and with'a row of ports forthe admission of fres fuel at the other end. of

i said cylinder, a cylindrical valve adapted to open and close thesaid admission ports a the said admission ports by a shdmg reciprocating motion, a cam comdouble race cooperamfwwnwto 18. In an internal combustion engine of.

the two-stroke type, whose cylinders are provided with a row of exhaust ports 'which are uncovered by the piston at the end of the stroke, and with a row of ports for the admission of fresh fuel at the other end of said cylinder, said cylinders having the radial disposition, mounted upon each cylinder and adapted to open and close the said admission ports by a sliding reciprocating motion, a cam ing an outlined portion cooperating with rollers in order to effect the sliding motion of said valve, abutment means cooperating with said valve in the closing position, a toothed ring rotating the said valve, a pin ion cooperating with said ring, first a shaft carrying said pinion, a bevel pinion concentric with the engine shaft and adapted to rotate the first-mentioned shaft of each engine cylinder, a toothed portion formed on the periphery of tor cooperating therewith, the said, sector and concentric with the rstmentioned shaft, a pinion mounted at the end of said concentnc shaft and a second pinion concentric with the engine shaft, engaging the said pinion; and adapted for external control.

19. In an engine as. claimed in claim 1, an exhaust pipe of great length adapted to effect the automatic scavenging of the engine cylinders by inertia, of the engine.

In testimony whereof I have signed this specification.

EUGENE HENRI TARTRAIS.

.a cylindrical slide valve at a certain speed race, cooperating with order to produce the haveach cam, a toothed seca shaft carr ing 

